The GetUserAgent function is
a built-in function
that returns the user agent, as indicated by the header of the HTTP (Stands for: Hyper Text Transfer Protocol)
message. This function is only available within the expression
editor.

Although this function can be used in any type of flows, it only returns
significant values in Web Flows.

By calling the GetUserAgent function, it is possible to redirect end-users
based on their browser versions. In the example below, end-users are redirected
to a lightweight version of the application if they have an older browser.